Waterproof paper and process of manufacture.



JACOB KINDLEBERGER, OE KALAM-AZOO,

MICHIGAN, ASSIGNOR TO THE KALAMAZOO,

VEGETABLE PARCHMENT CO., OF KALAMAZOO, MICHIGAN, A CORPORATION OF MICHIGAN.

WATERPROOF PAPER AND PROCESS OF MANUFACTURE.

No Drawing.

To all whom it may concern:

Be it known that I, JACOB KIN LEBERGER,

a citizen of the United States, residing at I Kalamazoo, Michigan, have invented certain new and useful Improvements in Waterproof Paper and Processes of Manufacture, of which the following is a specification.

This invention relates to improvements in waterproof paper and methods and process of manufacturing the same. l

The objects of the invention are to provide a pliable waterproof sheet of paper of high strength and durability.

Objects relating to details and economies will definitely appear from the detailed description.

I accomplish the objects of my invention by the devices and means described in the following specification.

The invention is fully pointed out in the claims.

As the means which I make use of in carrying out my process are well known to paper manufacturers, I have not deemed it necessary to illustrate the same.

In carrying out'my process, I take plain unglazed paper in the form of the waterleaf of any desired grade. The better the grade, however, the better the product and a pure cotton rag paper gives the best results. I subject the sheet of paper, by proper machines or devices, to the action of a solution of sulfuric acid of a test of about fifty-four degrees .Baum. The sheet is passed through this solution quickly, but is completely submerged and acted upon by the acid. The acid may safely test from fifty-three to sixty degrees. Any strength that will parchmentize and not burn. the sheet is permissible. The sheet is then passed through a washer and thoroughly flooded and washed with clear water so that all the acid is flooded and washedaway. The sheet is then thoroughly dried. The dried sheet is then subjected to the action of a solution of glycerin, the same being passed through a bath of glycerin, which is squeezed off by suitable rollers and the sheet dried by suitable fans, or otherwise, so thatthe water of the glyc- -erin solution is practically dried away.

That is to say, as much of the moisture is Specification of Letters Patent.

: ordinary Patented Feb. 2, 1915.

Application filed February 15, 1912. Serial No. 677,802.

evaporated as such drying means will elimmate. To secure best results, the glycerin treatment is repeated after about twentyfour hours. An antiseptic, such as carbolic acid, may be added to the glycerin. The solution of glycerin varies from sixtyfive to seventy-five per cent. of glycerin, the balance being water. When the parchmentized sheet of paper to the glycerin bath, the same is rolled up mto a tight roll and allowed to remain for a period of twenty-four hours or more. This insures that the glycerin shall permeate the parchmentized sheet as completely as it is possible for that to be accomplished by the glycerin, and the water has already been dried out of tical. The glycerin solution can be varied in strength. It is desirable to incorporate the glycerin with the'sheet in the minimum amount in practically a pure form to secure the best results. After the parchmentized roll of paper has been thus treated with glycerin for twenty-four hours or such a matter, the sheet is then passed through a parafiin coating machine and the hot paraflin is thoroughly forced-into the sheet by the machine and will be found to permeate effectively and completely waterproof the same. The result is that a very effectual waterproof sheet is. secured, which is notliable to breakage from abrupt folding, and which is substantially as flexible as a is very strong and durable. The material thus produced is very desirable wherever any waterproof sheet is desiredf ,It provides a substantially perfect waterproof bed covering, taking the place of a rubber sheet in all surgical cases, and is highly desirable for use in infants beds, and as a diaper or for use with diapers. The same constitutes an effective waterproof wrapping for any article or purpose. being impervious to moisture and a nonconductor, can bewrapped over the top of a cake of ice in a refrigerator and prevent waste.

The process of applying glvcerin and paraffin can be made use of in the treatment of parchmentized paper, but I prefer the exact method which I have indicated for the preparation of the parchment sheet the same very has thus been treated sheet of cotton or linen fabric and The material I thoroughly incorporating the itself, as the best results follow and the glycerin and parafiin are more completely and efiectively incorporated into the sheet in this way.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The process 'of waterproofing .paper, consisting in first subjecting a waterleaf sheet to the action of sulfuric acid fiftyfour Baum test; second, thoroughly washing the sheet and drying the same; third, subjecting the sheet repeatedly to a bath of from sixty-five to seventy-five per cent. of glycerin solution; fourth, drying the sheet and rolling the same into a tight roll; fifth, then passing the parchmentized sheet thus treated. with .glycerin through a paraflin coating machine and forcing the para into thesheet, as described.

2. The process of treating paper consist ing of first parchmentizing the sheet, second, cleansing and drying the same, third, impregnating the sheet with glycerin and glycerin into the same, and fourth, passing the said sheet through a paraflin coating machine and coating the same with paraflin, as described.

3. The process of treating paper, consisting of parchmentizing the sheet, impregnating the parchmentized sheet with glycerin and coating the said sheet with parafi n.

4. A waterproof sheet of paper suitably parchmentized by the sulfuric acid method and impregnated with glycerin and coated and impregnated with paraflin, as specified.

5. A sheet of parchmentized paper impregnated with glycerin and. carbolic acid and coated with parafiin.

6. A sheet of parchmentized paper impregnated with glycerin and an antiseptic and coated with paraifin.

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

JACOB KINDLEBERGER. a. 8-]

Witnesses:

' M. PHINA Woonnurr,

MARGARET Gmseow. 

